Alert archive / Iowa / Mesoscale Discussions in 2009
Mesoscale Discussion 556
The Storm Prediction Center issued this mesoscale discussion at Apr 24, 2009, 7:42 PM CDT for 5 states. It was in force for 63 min.
The area
The outline as issued.
The facts
- Issued
- Apr 24, 2009, 7:42 PM CDT (00:42 UTC)
- Expired
- Apr 24, 2009, 8:45 PM CDT
- In force
- 63 min
- Issued by
- the Storm Prediction Center
All 83 counties
Adair County, IA, Adams County, IA, Allamakee County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Cass County, IA, Chickasaw County, IA, Clarke County, IA, Clayton County, IA, Dallas County, IA, Decatur County, IA, Delaware County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Fremont County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hardin County, IA, Howard County, IA, Jasper County, IA, Lucas County, IA, Madison County, IA, Marion County, IA, Marshall County, IA, Montgomery County, IA, Page County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Winneshiek County, IA, Dickinson County, MI, Gogebic County, MI, Iron County, MI, Ontonagon County, MI, Fillmore County, MN, Houston County, MN, Winona County, MN, Worth County, MO, Adams County, WI, Ashland County, WI, Barron County, WI, Chippewa County, WI, Clark County, WI, Crawford County, WI, Eau Claire County, WI, Florence County, WI, Forest County, WI, Grant County, WI, Iron County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Menominee County, WI, Monroe County, WI, Oneida County, WI, Portage County, WI, Price County, WI, Richland County, WI, Rusk County, WI, Sawyer County, WI, Shawano County, WI, Taylor County, WI, Trempealeau County, WI, Vernon County, WI, Vilas County, WI, Washburn County, WI, Waupaca County, WI, Waushara County, WI, Wood County, WI
The radar
The La Crosse radar (KARX), 46 km from the middle of the area, began a volume at 00:45 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 0.7 hours before the alert went out and 184 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1032 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 181 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 24, 9:40 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Allamakee, Black Hawk, Boone, Bremer and 23 more | 65 min |
| Apr 25, 4:30 PM CDT | Severe Thunderstorm Watch | SPC | Appanoose, Davis, Decatur, Monroe, Wapello, Wayne | 6 hr |
| Apr 25, 5:32 PM CDT | Mesoscale Discussion | SPC | Cedar, Clinton, Delaware, Des Moines, Dubuque, Henry and 11 more | 73 min |
| Apr 25, 9:23 AM CDT | Mesoscale Discussion | SPC | Alcona, Alpena, Arenac, Barry, Bay, Clare and 27 more | 2 hr |
| Apr 25, 9:44 AM CDT | Severe Thunderstorm Watch | SPC | Alcona, Allegan, Alpena, Arenac, Barry, Bay and 35 more | 5 hr |
| Apr 25, 10:55 AM CDT | Mesoscale Discussion | SPC | Alcona, Alpena, Arenac, Barry, Bay, Calhoun and 31 more | 95 min |
| Apr 25, 12:06 PM CDT | Mesoscale Discussion | SPC | Arenac, Barry, Bay, Calhoun, Clare, Clinton and 26 more | 84 min |
| Apr 25, 1:55 PM CDT | Mesoscale Discussion | SPC | Allegan, Arenac, Barry, Bay, Berrien, Branch and 25 more | 95 min |
| Apr 25, 2:39 PM CDT | Severe Thunderstorm Watch | SPC | Allegan, Barry, Berrien, Branch, Calhoun, Cass and 23 more | 6 hr |
| Apr 25, 6:15 PM CDT | Mesoscale Discussion | SPC | Allegan, Barry, Berrien, Branch, Calhoun, Cass and 21 more | 60 min |
Nearby
Mesoscale Discussions in Iowa, 2009Mesoscale Discussions in Wisconsin, 2009Mesoscale Discussions in Michigan, 2009Every mesoscale discussion in 2009
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.